That’s higher than the $250,000 threshold President Barack Obama has suggested as the cutoff between the “middle class,” whom he says shouldn’t see tax increases, and those who should. The tax cuts approved during President George W. Bush’s administration are set to expire at the end of the year.

But many have argued that a $250,000 income for a family of four in expensive metropolitan areas like New York, Boston or Los Angeles is middle class and that a half-million is a more accurate marker for the wealthy.

In Kentucky, the $500,000 threshold would affect the top .32 percent — about one-third of one percent of households, according to 2010 tax filings with the IRS. In the region, only West Virginia has a smaller share of half-millionaires with a quarter of one percent bringing home more than $500,000, according to the Pure Politics analysis of IRS data. Meanwhile, Illinois had the highest share with about two-thirds of percent of the households earning more than a half-million dollars a year.

The IRS doesn’t itemize earners at the $250,000 mark. But it does categorize those who earn more than $200,000 a year.

And here’s how Kentucky compares to its neighbors when it comes to the percentage of millionaires it has among its tax filers:

Kentucky had 1,673 tax filers whose 990s in 2010 showed them bringing in more than $1 million. That’s not quite one-tenth of one percent. Again, only West Virginia has a smaller share with .07% (seven one-hundreths of a percent) — or 553 filers — earning more than $1 million in 2010, according to the IRS data.